Before using the Fertilizer Rate Calaculator below, here is what you need to know:
1. Total square footage of the area to be fertilized
2. What rate of Nitrogen to apply (for grass seeds, a rate 1 lb per 1,000 sq ft.
Using the first number in the formula from the bag of fertilizer you are using (ex. 15-5-10), in this instance, use the Nitrogen (N) rate of 15. From there, you will be able to calculate the number of pounds of fertilizer per 1,000 sq ft and then the total number of pounds needed for the job.